Registro de la variabilidad climática de escala milenaria en el último ciclo glaciar en los sedimentos de la cuenca Argelo-Balear

• J. Frigola ^[1] ; A. Moreno ^[2] ; M. Canals ^[1] ; I. Cacho ^[1] ; E. Colmenero ^[3] ; F. Sierro ^[3] ; J.A. Flores ^[3]
  1. [1] Universitat de Barcelona

     Universitat de Barcelona

     Barcelona, España

     
  2. [2] Instituto Pirenaico de Ecología

     Instituto Pirenaico de Ecología

     Zaragoza, España

     
  3. [3] Universidad de Salamanca

     Universidad de Salamanca

     Salamanca, España

     

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• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 5, 2004 (Ejemplar dedicado a: VI CONGRESO GEOLÓGICO DE ESPAÑA, ZARAGOZA, 12-15 JULIO, 2004), págs. 97-100
• Idioma: español
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• Resumen

  • Sediments from MD 99-2343 IMAGES core recovered in the Algero-Balearic Basin, north of the island of Menorca, have been analyzed for their bulk element composition and grain-size distribution to characterize the temporal evolution of the terrigenous input to this area throughout the last50 ka. The high-resolution elementary profiles show high frequency oscillations, particularly of Si,Ti and K contents, associated with terrigenous input variability. These fluctuations mark significant changes in the source areas and/or in the nature of transport and sedimentation processes mostlikely related to abrupt changes in oceanographic and atmospheric conditions. The Menorca corerecords were compared with the geochemical results of a previously studied core from the Albo-ran Sea, from where it became obvious a similar behaviour in some of the terrigeneous elementsat both core locations. The obtained records vary with a clear Dansgaard-Oeschger periodicity reaching higher values during the North Atlantic's Heinrich Events. These results evidence the presence of a millennial-scale synchronous pattern in the Western Mediterranean in terms of deposition of terrigenous material. In addition, grain-size analyses of Menorca core reveal rhythmic episodes of coarser particle inputs during the Holocene likely related to shifts in the intensity of deep-water currents.